Dodge Repair Questions? Ask a Mechanic for Answers ASAP
Hello, welcome and thanks for asking your question. My name is*****'m a Certified Auto Technician with 30+ years experience. I will do my best to assist you. please keep in mind that I may need to ask questions of you before I can answer. When you reply please feel free to add as much detailed information as possible pertaining to your concern.
There are a few possibilities for this concern. I have seen a faulty cruise control switch cause intermittent operation. Other times, I have seen the vacuum tubing wear holes in the tubing. Yet other times, I have seen the driver's side battery leak battery acid down onto the cruise control servo and either melt the vacuum hose or get into the cruise control servo and cause internal damage.
You will need to verify switch operation using a multi-meter, and visually inspect the vacuum line and cruise control servo for damage.
If you find no damage and want to diagnose the switches, let me know, you will need a multimeter and basic hand tools to run some diagnosis..
let me know if you want to perform electrical diagnosis on the cruise system ..
Even though the switch "mechanically" engages, doesn't mean that it "Electrically" engages...
Yes, The Vacuum Module that controls the speed is in fact the Cruise Control Servo that I am referring to above. This part is mounted below the driver side battery. It is common for a leaking battery to cause damage to the cruise control servo... This is why I'm recommending the visual inspection.
Keep me posted...